Device for dressing saw-teeth



(No Model.)

E. HOLDERMAN.

DEVICE EOE DRESSING SAW TEETE.

N0. 251,362.l Patented 1360.211881.

[l WITNESSES: Y INVENTOR:

WM ATTORNEYS.

Y UNITED STATES PATENT OFFICE.

EDMUND HOLDERMA, OF LIBERTY MILLS, INDIANA.

vDEVICE FOR DRESSING SAW-TEETH.

`SPECIFICATION forming part of Letters Patent No. 251,362, dated December 27, 1881,

Application tiled March 2B, 1881. (No model.)

To all whom it may concern:

Be it known that I, EDMUND HOLDERMAN, a citizen of the United States, residing at Liberty Mills, in the county ot Wabash and State ot' Indiana, have invented a new and useful Improvement in Devices for Dressing Saw- Teeth, of which the following is a full, clear, and eXact description, reference being had to the drawings hereto annexed.

The object of my invention is to give uniform set to saw-teeth after having been set and filed; andmy invention consists in a bar of metal having set-screws and an adjustable guard for gaging the degree of set in sawteeth, and suitable clamping devices for holding a reversible le at any desired angle of inclination.

In the accompanying drawings, Figure l represents a side view of my invention Fig. 2, abottom view; Fig. 3, a top view Fig. 4, a longitudinal section, and Fig. 5 a modification of the file.

The difficulty of giving even and uniform set to saw-teeth is well known. After a saw is set and filed it becomes necessary to measure the set and to reduce all surplus by filing. In doing this with most instruments there is danger ot' ling off too much, which necessitates a resetting of the teeth and repeated l ing. My invention is designed to obviate this difliculty, in that it is so constructed as to measure .and file with great precision, so as to remove no more than the surplus set.

The bar A is made with branches or arms at its rear end, which are provided with setscrews c c. The forward end of the bar which carries the Iile is provided with a stirrup, a, which its closely over the same, and is held adjustably in position by a screw, a', passing through a vertical slot in the stirrup and screwing into the end of the bar. The under side of this stirrup is provided with a projection, a2, having an angular horizontal groove for receiving the edge shaped end of file b. The rear end of the ile is secured in a similar manner in a horizontal groove in the adjustable guard d, which is provided with a screw, d', passing up through the bar A, and a suitable bracket, 612, on the upper side, the. said screw being provided with a thumb nut for raising and depressing the guard in the transverse recess a3 on the under side of the said bar; The file is thus designed to be held in an inclined position, and to accommodate this inclination the under side of the bar at its forward end, where the file is attached, is depressed or deiiected upward from the plane in which the bar moves. The said guard will be a fraction higher than the upper surface of the file, the rear end of the ile being thus carried close to the side of the saw and parallel with the set in the tooth when the guard strikes the set. To prevent the tooth from dropping behind the said guard, a set-screw, cf, is provided, which passes through the bar just-behind the guard. y

In ,combination with the bar as above described I purpose using a tile which may be reversed endwise and sidewise, so as to have four grades4 of le, and as each grade ot' le will require a guard in proportion to coarseness of file, I shall place suitable guards on the rear ends of said Jiiles whenever required.

My invention is operated as follows: The guard d and set-screws c c in the arms of' the bar are adjusted so as not to permit the tile to reduce the set beyond the required degree. Then, if greater or less angle is desired, operate set-screws c c and raise or depress the slotted stirrup a by means of its screw. Then adjust set-screw c in line with c c and d. This can be done by placing the device on the side of the saw or other iiat surface. Move the device to and fro upon' the flat surface of the saw, so that the file will pass entirely over the points of saw-teeth until the surplus set is removed. The extreme point of the tooth will thus have the widest set, so that the tooth will pass clear ofthe korf cut by the saw without binding.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a device for dressing saw-teeth, a straight narrow bar having two branches at one end and the under surface of its opposite end deected upward from a right line, in combination with a reversiblefile and means for securingthe tile to the bar, substantially as shown and described, and for the purpose set forth.

2. In a device for dessing saw -teeth, the combination of the bar A, having the under IOO surface of its forward end deflected upward nation with adjustable guard d, slotted stir- 'rom a straight line, the verlically-ztdji1stztble rup a, and reversible file b,substa.utia1ly as ro stirrup a, secured t0 said end by screw et', the shown and described, and for lche purpose set guard and file-holder d, having a. suitable forth.

5 thumb-nut, and reversible iie b, substantially EDMUND HOLDERMAN.

as shown and described. Witnesses:

3. In :t device for dressing saw teeth, the JESSE ARNOLD, bar A, having set-screws c c and c', in combi- J. W. FORD. 

